It’s not about what you use, it’s what you don’t.

XMPP + OMEMO & Mumble for chat, offline maps from OSM, self-hosted feed aggregator

NixOS, OpenWRT, LineageOS for microG, but would like to remove Android from my line up.

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• MullvadVPN, and a free and privacy respecting OS is another good idea.
• So is using privacy respecting apps: LibreOffice instead of MS Office, Codium instead of VSCode. And so on, with many FLOSS alternatives to the usual proprietary ones.
• Services also matter, imho: I’m using ProtonMail for my email (Tuta would be another clever choice, imho, and there are probably others). I’ve very recently switched from iCloud to filen.io for my cloud storage needs.
• Using one’s phone as little as possible. I’ve almost nothing on mine, I mean only stuff I’m required to have (banking and IDs, stuff like that), no email, no social, not even music or games (the game I enjoy the most play I also I enjoy it the most when I play it offline: chess ;))

And then… I also started using analog tools much more in the last two years. This helps a lot maintaining one’s privacy. Amazon can’t track my reading habits when I read a printed book (even less if I do not buy it from them), Goofle cant’" track my writings when I use pen and paper instead of their apps, Apple (or Google or Microsoft) can’t track my paper agenda or my paper notebook. And the NSA or whomever is playing that role in my country can’t ask any corporation to install backdoors in my IRL encounters with people so they could spy on me. At least, they cannot do that for now ;)

I use open-source applications that don’t require internet access for tasks that can be done perfectly offline, which is great not just for privacy but for many other reasons as well.